Is it legal to put nacho chips in a casserole? I still don't know the answer. However, it is legal to have nachos for dinner, so I assume it's acceptable. Either way, it's delicious.
So you take a bag of nacho chips and scatter in on the bottom of a 9 by 13. Then you top it with anything that seems vaguely mexican. I used a can of refried beans, a shredded zucchini and a shredded carrot (or two), tomatoes, cheese, and a light dusting of frozen corn.
Then you bake it in the oven at 350 until it's all bubbly.
The chips get a bit mushy, but oddly, it's not in an unpleasant way. And of course, you can always scoop them up with yet more chips.